Driving apparatus for printing-machines.



No. 668,350. Patented Feb. l9, 19m.

6. a; w. GIESECKE. DRIVING APPARATUS FOR PRINTING MACHINESK (Applicationfiled Mar. 23, 1900.)

(No Model.)

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N No. 668,350. Patented Feb. l9, I90l. a. a w. GIESECKE. DRIVINGAPPARATUS FOR PRINTING MACHINES.

(Application filed Mar. 23, 1900..

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(No- Model.)

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UNITED STATES ArnNr Urrrcn.

GEORG GIESEOKE AND WALTER GIESEGKE, OF LEIPSIG, GERMANY.

DRIVING APPARATUS FOR PRINTING-MACHINES.

SPECIFICATION formingpart of Letters Patent No. 668,350, dated February19, 1901.

Application filed March 23, 1900. Serial No. 9,911. (No model.)

T0 at whom it may concern.-

Beit known-that we, GEORG GIESEGKE and WALTER GIESEOKE, subjects of theEmperor of Germany, and residents of Leipsic, Germany, have inventedcertain new and useful Improvements in Printing Machines, (for which wehave obtained patents in Germany, dated September 10, 1899, Nos. 115,550and 115,551,) of which the following is a specification.

In the usual construction of two-revolution cylinder printing-machinesthe printing-cylinder receives its motion from the main driving-shaft bymeans of an intermediate gear- Wheel which turns upon a supporting-shaftrigidly attached to the frame of themachine. In machines of this typethe cylinder is usually raised when not in the act of printing and islowered to make the impression-that is to say, the cylinder rises andfalls once for each impression made. Owing to this movement thegear-wheel on the end of the cylinder-shaft does not perfectly mesh withthe intermediate gear-wheel when the cylinder is raised, and the resultis that considerable lost motion and backlash occur during a part of theaction of the cylinder. Up to this time little significance has beenattached to this defeet in this class of machines, probably because itwas supposed that it was quite sufficientif the cylinder gear-teethduring actual printing were in normal contact-'. 6., that the teethtouched one another in the pitchlines; butthe cylinder, as well as themechanism connected with it, has also, when the impression has takenplace and the cylinder is in the elevated position, various functions toperform which are of importance for the work of the machine-as, forexample, the opening and closing of the grippers, the raising andlowering of the laying-on gages, the

lifting and lowering of the sheet-holder, the

action of the fliers, &c. All these functions are dependent upon thecylinder, and therefore its motion influences them all. We have foundthat these functions in the two-revolution machines are not executedwith the regularity and smoothness which is absolutely indispensable toa faultless impression, and the cause of the disturbances in the actionof the mechanism dependent upon the cylinder we have discovered to bethe circumstance that the cylinder'wheel during a part of its revolutiondoes not perfectly fit into the cogs of the driving-wheel. For thesereasons we have devised and applied an improvement to the two-revolutionmachines which secures complete equality of interpenetration between theteeth of the wheels whether the cylinder be raised or lowered.

In carrying out our invention we mount the intermediate gear wheel upona movable shaft and provide automatic means for moving this shaft andgear-wheel relatively to the main drivinggear wheel and the cylindergear-wheel in a manner to secure the smooth and uniform action ofthemachine at all times during the different positions of the cylinder.

In the accompanying drawings, Figure 1 is a side elevation of thatportion of a printingmachine to which our invention relates and showingone form of our invention applied thereto. Fig. 2 is a vertical sectionon the line A B, Fig. 1. Fig. 3 is a side elevation of a modified formof our invention. Fig. 4: is an elevation and partial section on theline C D, Fig. 3. Fig. 5 is an elevation of another modification of ourinvention. Fig. 6 is an elevation and partial section on the line E F,Fig. 5.

Like numerals of reference designate like parts wherever they occur inthe diiferent views.

Referring to Figs. 1 and 2, the numeral 1 designates the maindriving-gear, 2 is the intermediate gear, and 3 the cylinder gear-Wheel. The gear-wheel 1 is rigidly fixed to the main driving-shaft 4:.The intermediate gear-Wheel 2 is mounted upon a stub-shaft 5, and thegear-wheel 3 is keyed to the cylinder-shaft. Toggle-levers 7 are journaled upon the main shaft 4 at one end 7, and their opposite ends 7 areloosely mounted upon the stub-shaft 5. A toggle-arm 8 has a bearing 8,loosely journaled upon the stub-shaft 5, and at its opposite or upperend a bearing 8 is mounted to turn on the cylindenshaft 6.

As shown in Figs. 3 and 4, a double elbowlever 7 8 is fulcrumed upon themain shaft 4, and the two members 7 of this lever are journaled upon thestub-shaft 5, while the members 8 of said lever have journaled betweenthem upon a pin 10 an eccentric-arm 11. A cam or eccentric 13 on the endof a shaft 12 has a bearing in the lower end of the end of aconnecting-rod 17, the upper end of' which is journaled upon thecylinder=shaft 6. The operation of this construction is such that as thecylinder is raised by the cam 16 and the connecting-rod 17 theintermediate gear-wheel is moved by the cam 13 to a position under thegear-wheel 3. It will be understood that these relative movements areproperlytimed, so that the intermediate gearwheel 2 moves in and out asthe cylindergear 3 rises and lowers and the teeth of the gear-wheels 2and 3 are always properly in mesh, preventing lost motion and backlash.

As shown in Figs. 5 and 6, an adjustable cam 14 surrounds the end ofshaft 12 and has a bearing in the lower end of an arm 18, fulcrumed onthe main shaft 4. The cam 14; may be adjusted to regulate the throw offork '7, which carries the intermediate gear-wheel 2. The remainingparts shown in Figs. 5 and 6 are substantially the same as shown inFigs. 3 and 4 and operate in the same manner.

It will be obvious from the foregoing that as the cylinder is raised andlowered the intermediate gear-wheel 2is always in close mesh with thewheels 1 and 3, thus insuring a smooth and regular movement without 6backlash, noise, or lost motion.

Having thus fully described our invention, what we claim is 1. In aprinting-machine, a main drivingshaft, a gear-wheel thereon, animpressioncylinder having a gear-wheel fixed to its shaft, anintermediate gear-wheel in mesh with the gear on the main shaft and thegear on the cylinder-shaft, and means for moving the intermediategear-wheel in and out as the cylinder raises and lowers, to insure theproper mesh of the gear-teeth, substantially as described.

2. In a printing machine, a main gear- Wheel, a gear-wheel on theimpression-cylinder, an intermediate gear between said two gear-wheels,toggle-arms for moving said intermediate gear wheel as the cylinder israised and lowered, and means for raising and lowering the cylinder.

In testimony that we claim the foregoing as our invention we affix oursignatures in presence of two witnesses.

GEORG GIESECKE. WALTER GIESECKE.

Witnesses:

RUDOLPH FRICKE, CHAS. J. BURT.

